Enumerating, or listing, the objects in a collection in PowerShell does not need a specialized command. For example, if the results of Get-PSDrive were assigned to a variable, enumerating the content of the variable is as simple as writing the variable name and pressing Return:
PS> $drives = Get-PSDrive
$drives
Name Used (GB) Free (GB) Provider Root
---- --------- --------- -------- ----
Alias Alias
C 319.37 611.60 FileSystem C:\
Cert Certificate \
Env Environment
...
ForEach-Object may be used where something complex needs to be done to each object.
Where-Object may be used to filter results.